usb to ttyS0 mapping issues -and wvdial configuration

[Lennart Sorensen]

On Mon, Aug 21, 2006 at 07:19:52PM +0300, Kihara Muriithi wrote:
> Hi all,
> I am tryiing to set up an Acer (Aspire 3610 model) laptop for dial up. The
> laptop don't have one of the most handy interface namely serial port. To
> connect to a serial port, one has to use a usb to serial cable and I find
> that very un-ideal. (Why the heck leave out a serial port and then turn
> around and start selling usb to serial cables?). Beside financial
> implication, I can't now figure out how to map ppp connection on. The first
> 4 ttyS* port looks like this to setserial
> linux:/home/William # setserial -a /dev/ttyS0
> /dev/ttyS0, Line 0, UART: unknown, Port: 0x03f8, IRQ: 4
>        Baud_base: 115200, close_delay: 50, divisor: 0
>        closing_wait: 3000
>        Flags: spd_normal skip_test
> 
> What I don't like is the lack of UART. What is the implication of above?
> I thought of mapping it to the USB device, but that even look worse to
> setserial
> linux:/home/wambugu # setserial -a /dev/usbdev2.1
> Cannot get serial info: Inappropriate ioctl for device
> Okay, one last shot I gave it one more shot
> linux:/home/William # wvdialconf  /home/William/Desktop/wvdial1.txt
> Scanning your serial ports for a modem.
> 
> Port Scan<*1>: S0   S1   S2   S3
> 
> 
> Sorry, no modem was detected!  Is it in use by another program?
> Did you configure it properly with setserial?
> 
> From the above queries, I decided to map modem to /dev/ttyS0. I also gave
> /dev/ttyS1 a shot with no success
> Now I hope that is enough information about the laptop. I believe some
> information about where the serial cable terminate would be important. It
> connects to a Huawei ETS2577 handset. The handset connect to the ISP through
> Qualcomm 3G CDMA wireless technology. I am also really hoping that UART will
> be inside this phone set, but I aren't sure of that.I believe this is
> sufficient information, but would happly suppiy more information is needed.
> Now, how can I make this setup work? I have been using wvdial and below is
> its configuration
> [Dialer Defaults]
> Modem = /dev/ttyS0
> Baud = 115200
> Init1 = ATZ
> Init2 = ATQ0 V1 E1 S0=0 &C1 &D2
> Init3 =
> Area Code =
> Phone = 777
> Username = some_name
> Password = some_password
> Ask Password = 0
> Dial Command = ATDT
> Stupid Mode = 1
> Compuserve = 0
> Force Address =
> Idle Seconds = 300
> DialMessage1 =
> DialMessage2 =
> ISDN = 0
> Auto DNS = 1
> Now, is there anything that I could have done wrong?.And does wvdial use
> /etc/ppp/chap-secrets file? What is the sure way of knowing that you are
> mapping an application to the right /dev? The link between the handset and
> ISP is fne for sure since I can make phone calls from the handset, so the
> issue has to be wvdial configuration and the ttyS0 interface. Oh, and my ISP
> is hostile to Linux, so I don't expect much help from them.

Usually usb serial adapters show up as /dev/ttyusb# or something like
that.  I have never seen one show up as /dev/ttyS#.  Depends on the
serial adapter and the driver I suppose.

--
Len Sorensen
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